Studies of South American Senecios-I

Abstract

The writer is fortunate in having had submitted to him for study relatively large series of undetermined specimens of South American Senecios, both from collections obtained on recent expeditions and also unidentified material of many years standing. t The United States National Herbarium, the New York Botanical Garden, the Field Museum of Natural History, the Gray Herbarium, the Philadelphia Academy of Natural Sciences, the British Museum of Natural History, the CEKew H-erbarium, the Botanical Garden, Brussells, the Botanical Garden and Museum, Berlin-Dahlem, the Museum of Natural History, Vienna, the Botanical Garden, Geneva, the Botanical Garden, Leiden, and the Botanical Garden, Utrecht, all have generously loaned unnamed material of Senecio for study. To those in charge of these herbaria, I extend sincere thanks. The study of this great assemblage of Senecio has made it possible to identify many of the older anid little-known species of this vast genus. It has been necessary to reduce to synonymy certain species and varieties, and to describe a few new species. It seems desirable and worth while to place on